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Metrics Configurations for Buckets

With CloudWatch request metrics for Amazon S3, you can receive 1-minute CloudWatch
metrics, set CloudWatch
alarms, and access CloudWatch dashboards to view near-real-time operations and performance
of
your Amazon S3 storage. For applications that depend on cloud storage, these metrics
let you
quickly identify and act on operational issues. When enabled, these 1-minute metrics
are
available at the Amazon S3 bucket-level, by default.

If you want to get the CloudWatch request metrics for the objects in a bucket, you
must
create a metrics configuration for the bucket. You can also define a filter for the
metrics collected using a shared prefix or object tags. This allows you to align metrics
filters to specific business applications, workflows, or internal organizations.

You can choose which objects in a bucket to include in metrics configurations
by using filters. Filtering on a shared prefix or object tag allows you to align
metrics filters to specific business applications, workflows, or internal
organizations. To request metrics for the entire bucket, create a metrics
configuration without a filter.

Metrics configurations are necessary only to enable request metrics.
Bucket-level daily storage metrics are always turned on, and are provided at no
additional cost. Currently, it's not possible to get daily storage metrics for a
filtered subset of objects.

Each metrics configuration enables the full set of available request metrics.
Operation-specific metrics (such as PostRequests) are reported only
if there are requests of that type for your bucket or your filter.

Request metrics support filtering by prefixes but storage metrics do
not.

Best-Effort CloudWatch Metrics
Delivery

CloudWatch metrics are delivered on a best-effort basis. Most requests for an Amazon
S3
object that have request metrics result in a data point being sent to CloudWatch.

The completeness and timeliness of metrics is not guaranteed. The data point for a
particular request might be returned with a timestamp that is later than when the
request was actually processed. Or the data point for a minute might be delayed
before being available through CloudWatch, or it might not be delivered at all. CloudWatch
request metrics give you an idea of the nature of traffic against your bucket in
near-real time. It is not meant to be a complete accounting of all requests.

It follows from the best-effort nature of this feature that the reports available
at the Billing & Cost
Management Dashboard might include one or more access requests that do
not appear in the bucket metrics.

Filtering Metrics
Configurations

When working with CloudWatch metric configurations, you have the option of filtering
the
configuration into groups of related objects within a single bucket. You can filter
objects in a bucket for inclusion in a metrics configuration based on one or more
of
the following elements:

Object key name prefix – Although
the Amazon S3 data model is a flat structure, you can infer hierarchy by using a
prefix. The Amazon S3 console supports these prefixes with the concept of
folders. If you filter by prefix, objects that have the same prefix are
included in the metrics configuration.

Tag – You can add tags, which are
key-value name pairs, to objects. Tags help you find and organize objects
easily. You can also use tags as a filter for metrics configurations.

If you specify a filter, only requests that operate on single objects can match
the filter and be included in the reported metrics. Requests like Delete Multiple Objects and
List requests don't return any metrics for configurations with filters.

To request more complex filtering, choose two or more elements. Only objects that
have all of those elements are included in the metrics configuration. If you don't
set filters, all of the objects in the bucket are included in the metrics
configuration.

How to Add Metrics
Configurations

You can add metrics configurations to a bucket through the Amazon S3 console, with
the
AWS CLI, or with the Amazon S3 REST API. For information about how to do this in the
AWS Management Console, see the How Do I
Configure Request Metrics for an S3 Bucket? in the
Amazon Simple Storage Service Console User Guide.